I would recommend TR4859 which leaves Cambridge at 15:59 and arrives at London Liverpool Street at 17:27.
That sounds fine. Can you reserve 6 tickets for me please?
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train-day train-departure train-destination train-leaveat train-people
train-day train-departure train-destination train-leaveat train-people
train-day train-departure train-destination train-leaveat train-people